AutoMAT

A new release will be finished shortly that will include a revamp of the original command line tool as well as an additional content pipeline-like tool that will monitor changes to source files and produce MATs in real time. The desired workflow is to just create and update your source images in your tool of choice (e.g. Photoshop) and have MATs automatically created or updated. Also includes various bugfixes and support for transparent and animated MATs.

AutoMAT is a new tool for creating 16-bit MATs. Unlike other tools, it can create higher quality MATs by performing Burkes dithering. It autogenerates high quality mipmaps using bicubic filtering. Mipmap results should be very similar to manual resizing with an application such as Photoshop. Mipmaps are also dithered. Unlike MAT16, AutoMAT does not create any tiling artifacts when dithering or resizing for mipmaps.

Currently AutoMAT is just a command-line tool. It accepts an image filename as an argument and outputs a MAT in the same directory. It doesn't have very useful error output at the moment, but if you're just passing in a common format (PNG, BMP, etc) with dimensions that are a power of 2, it should work fine.